Description of a new species of the rare genus Epacrolaimus Andrassy, 2000 (Dorylaimida, Aporcelaimidae) and new data on male of Paraxonchium laetiflcans (Andrassy, 1956) Altherr & Loof, 1969 (Dorylaimida, Paraxonchiidae) from Iran

摘要

Epacrolaimus reyesi n. sp., an amphimictic species of a rare nematode genus, is described and illustrated. The new species is characterised by its long body (7.23-7.87 mm), 32 um wide lip region, with well developed and distinct lips and liplets provided with longitudinal corrugation on their inner surface; 19-22 mu m long odontostyle with a wide, arched aperture occupying ca 85% of its length; 45-56 mu m long odontophore; 55-67 mu m long rounded tail, nine regularly spaced ventromedian supplements in males and 135-145 mu m long spicules. The new species is compared with two other known species of the genus, namely E. declinatoaculeatus (Kreis, 1924) Andrassy, 2000 and E. imperator Andrassy, 2000. Compared to the former, the new species has a rounded tail in females vs bluntly conoid, rounded on tip or with a minute peg, shorter tail (55-67 vs 63-75 mu m) shorter spicules (135-145 vs 215 mu m) and fewer male copulatory supplements (9 vs 12). Compared to the latter species, E. reyesi n. sp. is widerat the midbody region (172-178 vs 156-160 mu m), and has a shorter tail (55-67 vs 84 mu m in females and 58-65 vs 70-86 mu m in males), shorter spicules (135-145 vs 202-210 mu m) and fewer male copulatory supplements (9 vs 14-16). From both species thenew species differs by having a rounded tail vs convex-conoid or slightly subdigitate. Beside the new species, a population of Paraxonchium laetiflcans (Andrassy, 1956) Altherr & Loof, 1969 with relatively numerous males was found from forests of northern Iran. The male of this species, which had not been found in Iran so far and had been described on two specimens only, is described and illustrated in detail.